Machine serving to determine or verify the position of the filament of an electric lamp



July 21, 1931. AQJ. B. MARSAT 1,815,109

HINE SERVING TO DETERMINE 0R VERIFY THE POSITION OF THE FILAMENT OF AN ELECTRIC LAIP Filed July 22 1925 MAC INVEN rorz -14-T0/HEJB. MA/ZSA T Mum 6,

ATTORNEYS Patented July 21, 193].

UNITED STATES PATENT OFFICE ANTOINE JEAN BAPTIS'I'E MARSAT, OF VERRIERES-LE-BUISSON, FRANCE MACHINE SERVING TO DETERMINE 0R vERIrY THE POSITION OF THE EILAMENT 0E AN ELECTRIC LAMP 1 Application filed July 22, 1925, Serial No. 45,434, and in France June 3, 1925.

This invention relates to an apparatus permitting to determine or to verify the position of the filament of an electric lamp relatively to the securing members. 5 This apparatus comprises a support for the lamp and two optical devices which simultaneously form on one and the same screen placed infront of the operator two images of the filament which must coincide with reference marks traced on this screen.

If the support receiving the lamp has a constant position and if lamps of different dimensions are mounted on the same ma-. chine, it will be necessary to modify the adjustment of the optical systems each time one passes from lamps of a given dimension'to lamps of anotherdimension.

The present invention is adapted to permit of adjusting the optical devices once for all, without having to move them when passing, from one dimension or size of lamps to another.

It consists substantially in forming the support of the lamp in two parts, one secured to the frame, the other removable, the latter being made in as many sizes as there are lamps, so that by placing in the fixed part the movable part corresponding to the dimension of the lamp, the center of the latter is automaticall in the optical plane containing the axes o the two projectors.

The device is completed by a gauge which permits of verifying as many times as it is considered useful if the entire system is suitably adjusted. I

The invention is illustrated, but by way of example only, inthe accompanying drawings in which:

Fig. 1 is an elevation and Fig. 2 is a corresponding plan view ofthe movable part of the lamp support.

Fig. 3 shows in section and Fig. 4 in front view the fixed part of this support.

5 Fig. 7 is a diagrammatic view showing in Fig. 5 shows the whole in operative posiperspective the new device in position on the machine.

Fig. 8 is a side view and Fig. 9 is an end View of a gauge.

As illustrated in the drawings, the electric lamp (1 to be studied (Fig. 5),whether for verifying the position of the filament, or for adjusting with precision the relative position of the two portions of a two-part socketis placed in tongs I), having resilient branches 0 which can be tightened by means of a collar (1 screwing on the tongs and which can be operated by a handle 6.

The tongs are rigid with a tail piece f having two diameters separated by a shoulder 9 and terminated by a screw threaded end h which can receive a nut 2'.

This tail piece is adapted to be fitted in a support 7' in the shape of a massive socket,

secured on the front board 70 of the machine, which carries also the lamps of the projectors diagrammatically indicated at Z, Z and the prisms m m sending back at right angles the luminous bundles on the screen n.

The operation is as follows:

As many tongs b are provided as there are sizes of lamps. Therefore, if lamps of a determined size are to be verified, the corresponding tongs are chosen and inserted in the socket j. The nut i is tightened for immobilizing the tongs.

At this moment the center of a lamp a, mounted in the tongs, is in the plane of the optical axes of the projectors Z Z For verifying if any error or any misadjustment, a gauge 0 (Figs. 8 and 9) is mounted in the support in place of the lamp a; this gauge is provided with a flange p engaging in the tongs-in the place of the tenons of the lamp and a point 9, the end of which represents the center of the lamp. Having put this gauge in position it is verified at a glance if the end of the point is well projected on the screen at the center of the reference marks traced beforehand.

There are as many gauges as there are sizes of lamps; consequently, it is necessary to place on tongs corresponding to a determined size the gauge of the same size.

Owingt0 the arrangements which have just as to size according to the size of the lamp to tion.

, Claims p 1. A machine for determining or verifying the position of the filament of an electric light relatively to the supporting member thereof, comprising a fixed optical system including a plurality of focusing elements and lights, and a focusing screen therefor, a fixed supporting member centered relatively to said optical system and adapted to selectively support any one of a plurality of lamp supporting units capable of supporting lamps of different sizes and each adapted to be removably secured to the fixed supporting member and sustain its associated lamp in relative centered position with respect to the optical system.

2. In a machine for determining or verifying the position of the filament of an electric lamp, two optical systems, a screen associated with the optical systems, a supporting unit for fixing a lamp in a predetermined ciated with the optical systems, a supporting unit for fixing a lamp in a predetermined position, one of said supporting units being provided for each size of lamp to be tested, and means for selectively supporting any one of the supporting units in definite relation to the two optical systems and screen, the various supporting units being proportioned be supported therein, whereby the filament of each lamp occupies the same position with respect to the optical systems and screen, regardless of the size of the lamp.

4. In a machine for determining or verifying the position of the filament of an electric said supporting unit including tongs for engagement with the lamp.

5. In a machine for determining or verifying the position of the filament of an electric lamp, two optical systems, a screen associated with the optical systems, a supporting unit for fixing a lamp in a predetermined position, one of said supporting units being provided for each size oflamp to be tested, and means for selectively supporting any one of the supporting units in definite relation to the two optical systems and screen, said supporting unit including tongs having angular terminals constituting abutments for the lamp base studs.

The foregoing specification of my improvement in machines serving to determine or verify the position of the filament of an electric lamp signed by me this 12 day of June, 1925.

ANTOINE JEAN BARTISTE MARSAT.

provided for each size of lamp to be tested,

and means for selectively supporting any one of the supporting units in definite relation to the two optical systems and screen, 

